This was a common problem on my Dad's car. It is located in the front passenger's side of the engine. I believe it is a 7/16 inch bolt. The sensor is held in with a "fork-like" retainer - be careful the retainer is centered on the new sensor. It's a very easy replacement - disconnect the wire (connector is up by intake manifold), remove sensor bolt and retainer, and remove. Installation is reverse of removal.
The problems we have had were heat related - the car was fine when cold but would shut off when warm. One test I used is removing the sensor and hooking it up to an ohmmeter and putting it in a pot of water on the stove. If you have a closed circuit (some resistance) and the resistance goes to infinity when it gets hot, you've found the problem. Also, if the resistance is infinity from the start, you have your problem.
Alex Matolyak
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